Checking if a Number is Prime in Python

A natural number greater than 1 is considered a prime number if it cannot be divided evenly by any natural number other than 1 and itself. In other words, a prime number has no other divisors except 1 and itself.

Example Python Script (test.py):

# Python program to check if the user's input is a prime number

# User input
num = int(input("Please enter a number: "))

# Prime numbers are greater than 1
if num > 1:
    # Check for factors
    for i in range(2, num):
        if (num % i) == 0:
            print(num, "is not a prime number")
            print(i, "times", num // i, "is", num)
            break
    else:
        print(num, "is a prime number")

# Numbers less than or equal to 1 are not prime
else:
    print(num, "is not a prime number")

Output Examples:

$ python3 test.py
Please enter a number: 1
1 is not a prime number

$ python3 test.py
Please enter a number: 4
4 is not a prime number
2 times 2 is 4

$ python3 test.py
Please enter a number: 5
5 is a prime number

This script determines if a number is prime by checking if it has any divisors other than 1 and itself. If it does, it is not a prime number; otherwise, it is.